Furnace-arch construction



1,629,706 y 1927- 1.. H. HOSBEIN FURNACE ARCH CONSTRUCTION Filed July 25, 1923 5 Sheets-Sheet 1 1,629,706 y 1927' H. HOSBEIN FURNACE ARCH CONS 'I'RUCTI ON Filed July 25, 1923 5 Sheets-Sheet 2 1,629,706 y 1927- 1.. H. HOSBEIN FURNACE ARCH CONSTRUCTI 0N Filed July 25, 1923 5 Sheets-Sheet 4 Q1 Q I; 17 2067 Loans E HD8591 I2 L. H. HOSBEIN FURNACE ARCH CONSTRUCTION May 24, 1927.

Filed July 25, 1923 5 Sheets-Sheet 5 Q mm mm mm mm, ,QW hwy Mm mm kw w ll. 5 UH- H w d w |I.-I fi F WHMM -wmwf mwil u u u 0 u a u n llnl l BIB' W I I l I I I I|D|I1 1 II! I U B D F D! U a Va A v W w m 5 mm Loam H 1 1 0668172 6 erally as the furnace arch or arches.

' imposed Patented May 24, 1921..

UNITED STATES PATENT OFFICE.

LOUIS H. HOSBEIN, OI WINNETKA, ILLINOIS, ASBIGNOB TO H. DETBICK CO., 01'

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FURNACE-ARCH CONSTRUCTION.

Application and July as,

This invention relates to furnace construction, and particularly to improvements in the construction of the top or overhanging portions of furnaces, referred to egpresent im rovements have to do articularly wit arches of the type nown generally as suspended arches.

One of the general pur oses of the invention is the rovision o suspended arch construction a a ted for assembly in furnaces in conjunction with apparatus for the feeding and burning of pulverized fuel, and another eneral ob ect is the provision of suspended arch construction specially qualified for eflicient assembly and operation in furnaces of extraordinary width.

A more particular object of the invention is the provision of an improved suspended arch construction which Will contribute to the efficiency of pulverized fuel feeding and burning apparatus, by inducin an immediate and uniform diffusion of t e fuel upon its injection into the furnace, and thereby attain early ignition and uniform and complete combustion in the desired portions of the furnace.

Another object of the invention is the provision of an arch construction effective to attain efiicient combustion of pulverized fuel in furnaces of limited height.

Still another object is the provision of a suspended arch construction which will effective] withstand the conditions of wear by the use of pulverized fuel which is [pneumatically fed.

highly important object is the rovi-- sion of an arch construction having t e attributes above specified which requires the use of minimum variety in its component parts, and which is susceptible of quick and economical re air in any part which may become injures or worn incident to use.

Other important considerations are the provision of a construction in which parts susceptible to injury by heat are aflorded the proper coolin ventilation, and the structure as a who e is afforded the proper latitude of expansion and contraction without imposing injurious strains on its component parts or u on the portions of the installation with w ich it is associated.

Other and further objects of the invention 1823. Serial No. 853,857.

will be pointed out hereinafter, indicated in the ap ended claims, or otherwise ascertainable fi'om the present disclosure. For the purpose of this application I have elected to illustrate the various features comprised in my invention by two structural embodiments; but it is to be understood that the same are here presented for pur oses of illustration only, and are not to e accorded any interpretation havin the effect of limiting the invention which purport to secure, short of its true and most comprehensive scope in the art.

In the drawings forming a part of this specification,

Fig. 1 is a top view of an arch construction applied to a wide furnace in association with pulverized fuel feeding apparatus;

Fig. 2 is a part transverse sectional elevation taken substantially on line 2-2 of Fig. 1;

ig. 3 is a longitudinal sectional elevaiion taken substantially on line 3-3 of ig. 4 is a longitudinal sectional elevation taken substantially on line 4-4 of Fig. 1, but showing certain parts of the boiler setting not illustrated in Fig. 1;

Fig. 5 is a top view of an arch of different construction embodying certain features of my invention;

Fig. 6 is a transverse sectional elevation, the same taken on substantially line 66 of Fi 5; and

Fig. 7 is a longitudinal sectional elevation taken substantially on line 7-7 of Fig. 5, but showing certain portions of the boiler setting and fuel feeding apparatus not illustrated in Fig. 5.

The nature of the invention will be most readily ascertained by reference to the illustrative disclosure in detail, whence it will be observed from the drawings the reference character 2 designates a front wall of a furnace chamber. and the reference characters 4 designate side wall portions. Transverse beams 5 and 6 are disposed respectively at the forward and rearward portions of the furnace chamber, being supported at their ends on the side walls 4 or in other suitable fashion. These constitute the main supporting beams of the structure. They carry longitudinal beams 7 which are preferably secured by bolts, and may be disposed at any desired or requisite intervals. Certain of these longitudinal beams support pedestals 8 on which are carried the transverse hanger beams 9. The latter, in turn, support top beams 10. Adjacent the front and rear ends of the longitudinal beams 7 are supported short supplemental hanger beams 11. Beam 5 and supplementalhanger beams 11 at the front of the furnace aflord support for series of similar arch bars 12 which are suspended by hangers 14. By reference to Fig. 1 it will be observed that these front arch bars 12 are suspended in three groups located res ectively at the sides and the longitudinal mi dle part of the arch, with space intervening between the adjacent groups. At the rear of the arch the rear arch bars 15 are suspended by hangers from the beam 6 and the ban er beams 11, said arch bars 15 preferabl being arranged in alignment with the ront arch bars .12 and like them are disposed in three groups with intervening space. The length of the arch bars 12 and 15 is such that there is a considerable interval of space between their ends, which space lies along the transverse median portion of the top arch. Similar tile 16 are suspended on the arch bars 12 and 15 to form front and rear portions of the top arch. The arch bars 15 carry rear end brackets 17 on which are suspended wedge-shaped tile 18 to form a rear fan end as a continuation of the flat arch portion carried on the arch bars 15 and extending upwardly therefrom toward the boiler passes. This rear end construction here illustrated is that described and claimed in my Patent No. 1,544,580. Intermediate the groups of arch bars 12 are suspended series of riser arch bars 19. These bars are suspended from the beams 5 and 9 by means of hangers 20, and as best seen in Figure 4, their lower and forward end portions are disposed so that their tile retaining flan es 19 occupy horizontal positions parallel w1th the corresponding flanges of the arch bars 12. The form of the riser bars is such that from that position the tile retaining flanges curve upwardl rather sharply and then take a rearwardly ascending direction so that their rearward ends reach a osition considerably above and to the rear of their forward ends. At the rearward part of the arch between the roups of rear arch bars 15 are suspended simi ar riser bars 21, preferably in alignment with the riser bars 19. They are suspended from the beams 6 and 9 and conform generally to the shape of the front riser bars 19. The tile retainlng flanges 21 at their rearward portions are disposed at the same level and parallel with the tile retaining flanges of the arch bars 15. Upon their rear extremities are mounted rear end brackets 22 like the brackets 17. Tile 24 similar to the tile 16 are suspended on the horizontal flanges of the riser bars 19 and 21 and form transverse continuations of the top arch portions constituted of the tile 16. On the rear end brackets 22 are suspended the wedge-shaped tile 25, like the tile 18, which they abut laterally, so as to form the curved rear end continuously across the furnace. At the corner portion of the riser bars 19 are suspended wedge-shaped tile 26, the lower ends of which form an upwardly deflected continuation of the arch surface afforded by the ends of the tile 24. Above the tile 26, tile 27 are suspended on the riser bar 19, so that their inner ends form upward rearwardly inclined continuations of the arch surface afforded by the tiles 26. Above the tile 27 wedgeshaped tile 28 are suspended on the riser bars so that their inner ends form further continuations of the surface afforded by the ends of the tile 27. Upon the rear riser bars 21 are suspended tile 29, 30 and 31 corresponding in form and arrangement to the tile 26, 27 and 28 respectively, whence it results that the arch surface formed by the tiles supported on the riser bars 21 forms a forwardly inclined rising continuation of the arch surface afforded by the ends of the tile 24. There will be as many groups of these riser bars 19 and 21 as there are fuel openings in the arch. In Fig. 1 I have shown a construction in which there are two fuel openings and therefore two groups of these riser bars, disposed at'the front and the rear of the fuel openings and forming, with their supported tile, wall portions converging upwardly toward the median portion of the arch. Laterally of the structure carried on the riser bars 19 and 21, are arranged transversely extending lateral arch bars 32, which are suspended on the outer longitudinal beams 7. These arch bars have tile retaining portions which in the outer portions of the bars are horizontal and on the inward portions of the bars are deflected upwardly, as illustrated in Fig. 2. Tile 32 are suspended on the horizontal portions so as to form flat lateral portions of the top arch and wedge tile 35 are suspended on the upwardly deflected portions of the bars so as to form upward and inward continuations of the arch surface. The tile 34 fill the intervals between the tile 16 on the front and rear arch bars 12 and 15, while the portion of the arch formed by the tile 35 closes the lower portion of the space between the converging walls carried on the riser bars 19 and 21. The inner ends of the bars 32 have shelves 32 upon which are built up the lateral brick walls 36 which closes the upper portion of the space between the wall portions carried on the riser bars 19 and 21. Similar construction is employed between the groups of riser bars 19 and the groups of riser bars 21, excepting that the intermediate transverse arch bars 37, which correspond to the arch surfaces.

bars 32, are provided with upwardly extending end brackets 38 which correspond in function to the upwardly deflected inner ends of the lateral arch bars 32 and support the wedge tile 35 and the lateral wal portions 36. Thus it will be seen that the refractories supported by the associated riser bars 19 and 21 and the transverse arch bars 32 and 37 form turret-like structuresextending upwardly from the flat top arch portions constltuted of the tile 16, 24, 34 and 34, the inner wall portions of which turrets diverge downwardly toward the furnace chamber and merge with the juxtaposed flat top arch A discharge spout or nozzle 39 of the pulverized fuel feeding apparatus is arranged to discharge into the top of this turret chamber and the chamber is closed at the top about the spout, by closure tile 40 suspended on the to beams 10.

As is recognized in the art, in the operation of neumatieally fed ulverized fuel burners tie fuel is customan y injected into the furnace chamber in a blast of air so that it takes a downward and rearwardly circulatory movement in the course of which it is ignited and consumed. It is highly important therefore that in order to secure proper combustion, there must be proper diffusion of the pulverized fuel in the air in which it is carried, and the vertical space within the combustion chamber must be ample to afford the material the necessary time for combustion. B virtue of the construction above described, therefore, it will be observed that the provision of the turret chambers for reception of fuel from the s outs not only facilitates the diffusion of t e pulverized fuel by virtue of the diverging or flaring form of the chamber, but also provide additional vertical space for circulation of the material during combustion. Moreover the construction is such that the refractories are subjected to minimum erosive effect from the injected material, and offer minimum resistance to its travel. An important advanta e of the construction resides in the fact t at the various parts of the refractory structure are independently supported, a circumstance which not only permits respective portions of the structure to accommodate themselves to varying conditions imposed by changes in temperature, but obviates their use as loadcarrying portions of the structure, thereby contri uting to their durability and to facility and economy in installation and repair. The relationship of the constituent assemblies is such that no opportunity is afforded for the opening of joints incident to expansion from high temperatures, and the disposal of the metallic work upon which the structure is dependent for its support is such as to afford it ample cooling ventilation. It is to be observed that except for ordinary fire brick, used in the wall portions, the construction involves the use of only two forms of refractories, viz, the plain tile of which those indicated by the numerals 16 and 27 are typical, and the wedge-shaped tile t pified by those designated by the numerals 26 and 18. It is also to be observed that, in spite of the extremely irregular and unconventional conformation of the refractory arch, each tile is afforded individual suspension and indedependent adjustability and only one surface of each tile is exposed in the furnace chamber.

The embodiment illustrated in Figs. 5 to inclusive presents a simpler construction than that above described, and one which is likewise adapted to contribute to the diffusion and desired circulation of the pulverized fuel. In this embodiment, as in that above described, there is the front wall 2, the side Walls 4, the front transverse beam 5, the rear transverse beam 6 and the longitudinal beams 7. Here also are the front arch bars 12, the rear arch bars 15 with their tile 16 forming front and rear flat arch portions, and with the rear arch bars 15 carrying the rear end brackets 17 supporting the wedge tile 18 to constitute the rear fan end. The longitudinal beams 7 carry the transverse lateral arch bars 32 at the outer sides of the fuel inlet 0 )enings, and intermediate transverse arch are 37 between the inlets. These support the tile 34 and 34' forming flat arch ortions and the bars 37 have the upwardly iverted terminal portions adjacent the inlets upon which the wedge tile 35 are suspended, while the lateral arch bars sup ort at their terminals adjacent the fuel in ets the wedge tile 35. The spouts 39 are arranged to into the furnace chamber in oblique or inclined directions, as distinguished from the vertical, this disposal being accommodated by the form contributed to the walls of the inlet openings by the wedge tile 35 and 35, the arrangement iving the walls of the inlet openings a ownwardly diverging or flaring form from the end of the spout to the combustion chamber. The construction contributes to diffusion of the fuel, and by making provision for its injection obliquely into the combustion chamber, affords an increase in the length of the path of circulation without increasing the vertical height of the combustion chamber. An added advanta e of this construction resides in the fact t at the tile 35' contiguous to and ahead of the spout o ening may be removed from the exterior o the furnace and while it is in operation, by simply sliding them upwar 1y off of the upwardly deflected ends of the arch bars 37, and replacement made in correspondin fashion. The construction is of great utility by virtue of its adaptadischarge bility to a great variety of circumstances, and because of the further facts that it permits desired adjustments of the spouts of the fuel feeding apparatus without requiring any dismantling of the arch, and permits repair and replacement of arch portions without requiring removal of the fuel feeding apparatus. A feature of great importance is its simplicity of construction and the limited variety of shapes required in its construction. As in the embodiment above described, only the two forms of tile are required, and only four forms of arch bars.

I claim:

1. In furnace arch construction, in combination, supporting members pendulously suspended above the furnace chamber, refractories suspended thereon in courses to form flat top arch portions, said courses be ing interrupted to afford an opening through the arch, certain of the supporting members having upwardly diverted portions at said opening, and refractories suspended on said upwardly diverted portions to form a slopin wall for said opening as a continuation of the flat under surface of the arch.

2. In a furnace arch construction, in com bination, supporting members pendulously suspended above the furnace chamber, refractories suspended therefrom in association to form flat top arch portions, said supporting members having upwardly diverted portions, refractories supported on said portions in association to form a turret above the fiat to arch portions with the inner wall thereo formed as a continuation of the flat under surface of the arch, said turret affording an opening at its upper portion for the introduction of fuel.

3. In furnace arch construction, in combination, beams disposed above the furnace chamber, supporting members pendulously suspended from said beams, refractories suspended on said sup orting members to form flat top arch portions, certain of said supporting members having upwardly diverted terminal parts, and refractories car ried on said parts to form the walls of a turret extending upwardly from and. as a continuation of the flat top arch portion, said turret affording a chamber communicating with the furnace chamber.

4. In furnace construction, the combination of beams disposed above the furnace chamber, supporting members penduously suspended therefrom, refractories suspended on the supporting members in association to form flat top arch portions, certain of said supporting members having upwardly diverted portions, refractories carried thereon to form upwardly converging turret walls as continuations of the flat arch portions, said walls being associated to afford a turret chamber above the furnace chamber, said turret chamber having a fuel inlet at its upper portion.

5. In furnace construction, the combination of beams arranged above the furnace chamber, supporting members pendulously suspended therefrom, refractories suspended from said supporting members in association to form flat top arch portions, the terminals of said supporting members being arranged to afford an interruption in the flat top arch portion, and refractories carried on said terminals to form associated turret walls extending upwardly as continuations of the fiat arch portion, said walls being associated to form a turret chamber above and in communication with the furnace chamber, said chamber being provided with a fuel inlet in its upper part.

6. In furnace arch construction, the combination with beams arranged above the furnace chamber, of riser bars pendulously suspended on said beams, said riser bars having horizontally extending tile supporting portions and upwardly extending tile supporting portions, refractories suspended on said horizontal portions in association to form flat top arch parts, and refractories suspended on said upwardly extending portions to form turret wall parts above the flat arch.

7. In furnace arch construction, in combination, beams arranged above the furnace chamber, riser bars pendulously suspended from said beams, said riser bars having horizontally extending tile supporting portions and upwardly sloping tile supporting portions, refractories suspended on the horizontal tile supporting portions in association to form flat top arch parts, and refractories suspended on the sloping tile supporting portions in'association to form inclined turret wall parts above the flat top arch.

8. In furnace arch construction, in com bination, beams arranged above the furnace chamber, riser bars pendulously suspended therefrom, said riser bars having horizontal tile supporting parts and upwardly slopin tile supporting parts, refractories suspende on said horizontal tile supporting parts in association to form flat top arch portions. upwardly sloping tile supporting parts of certain riser bars being associated in converging relationship, and refractories supported on said sloping parts in association to form upwardly converging turret wall portions above the flat arch portions.

9. In furnace arch construction, the combination of beams disposed above the furnace chamber, tile supporting members endulously suspended from said beams an extending upwardly intermediate said beams, and tile suspended on said tile supporting members to form furnace arch portions below the beams and intermediate the beams.

10. Furnace arch structure comprising, in combination, supporting beams, arch bars suspended thereon in upwardly converging relationship, refractories suspended on the arch bars to form oppositely disposed converging wall portions and closure tile suspended above said wall portions to form a roof for intervening space, said closure tile being supported independently of said wall portions.

11. Furnace construction comprising, in combination, supporting beams, riser bars suspended in oppositely disposed series, refractories supported on said riser bars to form oppositely associated walls, and closure refractories supported at the top of said walls and independently of said riser bars to form a cover for space between them.

12. Furnace arch structure comprising, in combination, supporting beams, vertically extending arch bars suspended thereon in opposite relationship, refractories supported on the arch bars to form associated wall por tions, a closure arch supported independently of said walls to cover intervening space, said closure arch affording a passage communicating with the intervening space.

13. Furnace arch structure comprising, in combination, arch bars suspended in a series about a combustion chamber portion, refractories supported on said arch bars to form the walls of said chamber portion, and refractories suspended independently of said arch bars to form a top closure for said chamber portion.

14. The combination with supporting beams, of a furnace top arch portion suspended thereon, riser bars suspended in vertical position to extend upwardly from the top arch portion, refractories supported on said arch bars to form a turret above the top arch portion, and a closure arch supported independently of said arch bars to form atop for the turret.

In testimony whereof I have hereunto signed my name.

LOUIS H. HOSBEIN. 

